I am new to this group and would appreciate any help.
Looking at the rtlsdr driver, I see that there seems to be some code to
correct the IQ balance, but I'm only going by the names of functions like
"_IQ_Tree" and "_Compare_Cor". The algorithm, if there is one, is not at
all clear nor of direct interest, the question is whether or not there is
some IQ balance built into the rtlsdr driver and does anyone know how
effective (e.g. in terms of image suppression) it is.
Then, I'm using this device and software to demonstrate to students the
concepts of SDR. So on a related note, if there is some IQ balance
correction in the driver, can it be turned off? Changing the driver code is
way beyond my ability, but some digging suggests that changing the header
file to have
#define IMR_TRIAL 0.
eliminates a quite complex looking loop of computation that may be the IQ
balance scheme. As a newbie I wouldn't attempt this without some positive
guidance.
It would require a new build of the driver, which I imagine is the same as
for the normal case, and then if it can be done, it would be great to
illustrate the basic IQ balance of the hardware and the improvement
possible with software correction.
thanks Richard
All,
I have released openLTE V00.08.03 (http://sourceforge.net/projects/openlte/)
with support for HackRF and RTL-SDR via GrOsmoSDR. Using this release, I
have been able to successfully decode broadcast information (MIB and SIBs)
from LTE networks.
I was also wondering if there is a good way to determine which type of
hardware is connected? Currently I am using the get_sample_rates routine
and comparing the maximum against the expected max for each hardware type.
Thanks,
Ben
Hello to all,
I am an electrical engineering student from Brazil and I have already been
studying GNURadio using RTL-SDR for a while (I have an EZCAP dongle). This
is my first post here. I am studying the basic FM receiver and my question
is:
Which is the actual receiver architecture used in the RTL-SDR dongles? I
mean, do we have a Hartley receiver, a Weaver receiver, a zero-IF receiver,
a low-IF receiver?
Also, the E4K tuner has two outputs: one output is the in-phase component
and the other output is the quadrature component. So, does the RTL2832U has
two ADCs to sample the two components? Or just one ADC and it samples the
two components interleaved?
Thanks very much in advance,
Lucas Ingles
